/Engine/Source/Editor/CurveEditor/Public/CurveEditor.h
Returns whether the buffered curve is to be acted on, ie. selected, in the tree view or with selected keys
bool IsActiveBufferedCurve ( const [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [IBufferedCurveModel](API\Editor\CurveEditor\IBufferedCurveModel) > & BufferedCurve ) const